Modelling the Energy Extraction from Low-Velocity Stream Water by Small Scale Archimedes Screw Turbine

Q1 Chemical Engineering
Man Djun Lee , Pui San Lee
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引用次数: 7

Abstract

In recent years, there has been a growth of interest in the development of micro-hydropower power generation, especially in the low-head turbine. Low-head turbines gained popularity due to their high efficiency, relatively low cost, ability to operate at a low flow rate, and low environmental impact. In this aspect, the Archimedes Screw Turbine (AST) could be the primary key to electrifying the rural area in Sarawak, Malaysia, which is surrounded by rivers. This study starts with a conceptual design based on literature review findings. Eventually, the small-scale prototype is then being built and tested in the laboratory. The experiment is set up to simulate the actual Sarawak river velocity to determine the relationship between key performance variables such as the inclination angle of AST and water flow velocity. The findings revealed that the 45° angle of inclination was the optimum angle of AST within the water velocity of 1.0 m/s until 1.5 m/s. At this angle, the highest revolution per minute (RPM) generated by the AST shaft was 179.8, and the highest torque recorded was 0.9Nm. The results were validated through statistical means. It was found that both angles of inclination and river water velocity are significant to RPM and torque generation (p < 0.05). Two statistical models were generated based on linear regression to explain the contribution of water velocity and angle of inclination as inputs to torque and RPM as outputs, with a Pearson R2 value of more than 60%. The maximum mechanical power generated is about 1.54 kW, with a maximum efficiency of 94.6%. The outcome of this study would be useful for designing a small-scale AST power generation system by utilizing a low-flow river (velocity < 1.5 m/s) as a power source. This study would contribute to the existing knowledge stock of small-scale AST, primarily to operate in low-flow velocity rivers. For the future study, it is recommended for conducting a pilot study to test the actual performance of AST in the Sarawak River or rivers with similar flow characteristics.

小型阿基米德螺旋涡轮从低速水流中提取能量的模拟
近年来,人们对微型水力发电,特别是低水头水轮机的发展越来越感兴趣。低水头涡轮机由于其高效率,相对较低的成本,在低流量下运行的能力和低环境影响而受到欢迎。在这方面,阿基米德螺旋涡轮机(AST)可能是马来西亚沙捞越农村地区电气化的主要关键,该地区被河流包围。本研究在文献回顾的基础上进行概念设计。最终,小型原型机将在实验室中建造和测试。模拟砂拉越河实际流速,确定AST倾角等关键性能变量与水流流速的关系。结果表明,在1.0 m/s ~ 1.5 m/s水速范围内,45°倾角为AST的最佳倾角。在此角度下,AST轴的最高转速为179.8转/分钟,记录到的最高转矩为0.9Nm。通过统计方法对结果进行了验证。结果表明,倾斜角度和河水流速对转速和扭矩产生均有显著影响(p < 0.05)。在线性回归的基础上,建立了两个统计模型来解释水流速和倾角作为输入对扭矩和转速作为输出的贡献,Pearson R2值大于60%。最大产生的机械功率约为1.54 kW,最高效率为94.6%。本研究结果将有助于设计利用低流量河流(速度 < 1.5 m/s)作为电源的小型AST发电系统。这项研究将有助于现有的小规模AST知识储备,主要是在低流速河流中操作。对于未来的研究,建议进行一项试点研究,以测试AST在砂拉越河或具有类似流量特征的河流中的实际性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of King Saud University, Engineering Sciences
Journal of King Saud University, Engineering Sciences Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
12.10
自引率
0.00%
发文量
87
审稿时长
63 days
期刊介绍: Journal of King Saud University - Engineering Sciences (JKSUES) is a peer-reviewed journal published quarterly. It is hosted and published by Elsevier B.V. on behalf of King Saud University. JKSUES is devoted to a wide range of sub-fields in the Engineering Sciences and JKSUES welcome articles of interdisciplinary nature.
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